Knot actuated stop motion



M. H. ROSENFELD 2,125,348

KNOT ACTUATED STOPMOTION Fil ed Sept. 9', 1937 T 7" I T n mm 2 Sheets-Sheet l- Ang 19380 M. H. ROSENFELD 2,126,343

KNOT ACTUATED'STOP MOTION' F iled Sept. 9, 1937 2 Sheets-Sheet 2 Patented Aug. 9, 1938 2,126,348

UNITED STATES PATENT OFFICE KNOT ACTUATED STOP MOTION Mitchell H. Rosenfeld, Cleveland Heights, Ohio Application September 9, 1937, Serial No. 163,151

3 Claims. (01. 28-64) This invention relates to stop motions for knitbeing provided with a binding nut 2| whereby it ting machines, looms and like mechanisms and may be connected to an electric wire. The posts particularly to devices which are engaged by a N5 and I! are provided with apertures for the knot in a traveling thread, which devices initiate laterally projecting trunnions 22 of a transversely 5 the operation of any usual or suitable stop motion. extending plate 23. The plate 23 has, therefore,

The general object of my invention is to provide rocking engagement with the posts It and I7 and a very simple and readily actuated stop motion of is free to oscillate in a vertical plane. This plate this character and particularly to provide a con is forwardly extended at 23 at its middle and is struction which, while adapted to the initial actuprovided with the inwardly extending very acute in ation of mechanical stop motions, is particularly V-shaped slot 24. This slot is wide enough for 10 adapted to initiate the actuation of an electrical the passage of the yarn or thread a, shown in stop motion. Fig. 1 and in Fig. 5. That end of the plate 23 Another object is to provide a device of this adjacent the post I 6 is provided with the outcharacter which may be quickly and readily rewardly projecting lug or arm 25, the edge face of in set after the machine has been stopped by a knot which is slightly re-entrantly angled at 25. Supengaging my mechanism, and a further object ported upon a post 2'! extending upwardly through is to provide a device of this character which may the plate 15 and held thereon by the nuts 28 and be readily applied, which is extremely simple, insulated from the plate by the insulation 29 is a which will not readily get out of order and which latch 30. One arm of this latch is angularly bent can be easily adjusted at any time. and then extended across the front of the post 0 Other objects will appear in the course of the 21, as at 3|. The other arm of the latch is bent following description. parallel to the first named arm, then laterally My invention is illustrated in the accompanying extended away from the first named arm and drawings wherein: then longitudinally extended at 32. The two arms Fig. 1 is a front elevation of a bobbin support of this latch are held in pivotal engagement upon 25 and my knot actuated circuit closing mechanism the post 21 by means of the transverse pivot pin 33 applied in connection therewith. so that the latch is free to oscillate. A spring 34 Fig. 2 is a diagrammatic view showing my stop coiled around the pivot pin 33 has one end bearing motion actuated mechanism in side elevation and against the rear face of the post 21 and the other showing an electrical circuit diagrammatically. end engaged with the arm 32. This spring urges 30 Fig. 3 is a top plan view of my mechanism, th this arms 32 downward with a light pressure. supporting bolts being in section. V The latch is limited in its downward movement Fig.4 is afront elevation of the structure shown by reason of the portion 3! striking the post 27. in Fig. 3, The lower edge of the arm 32 is formed with 35 Fig. 5 is a section on the line 5-5 of Fig. 4, ratchet teeth 35, as shown in Figs. 5 and 6, and :55 showing the parts in their normal position and these ratchet teeth are adapted to be e a ed before being actuated bya knot. by the outer edge 26 of the lug 25. When the Fig. 6 is a section on the line 6-6 of Fig. 4, plate 23 is lifted from the position shown in Fig. with the yarn guide lifted. 5 to the position shown in Fig. 6 by a knot in the 40 Referring to these drawings, it will be seen that thread a, the lug 25 will, of course, be lifted and 40 I have illustrated in Fig. 1 a frame having a base will eng e W the fit ot es 35, and this ID, uprights ll, cross-bars l2 and thread guide will hold the plate raised until the latch is and tensioning means generally indicated T. manually released.

This is purely illustrative. Mounted upon this While this mechanism may be used in connecframe are the bobbins [3 from which thread or tion with any mechanically operated stop motion, 4.5 yarn is illustrated as being taken, the yarn mov- I have designed it for and illustrated it as used ing in the direction of the arrow in Fig. 1, in connection with an electric stop motion. In- Suspended from the cross-bar 12 by means of the asmuch as electric stop motions are well known, bolts 14 is a plate I 5. Extending upward from I have not attempted to illustrate any details this plate are the two posts It and H, these but have shown the stop motion as including an 50 posts being shown as screw-threaded at their electromagnet 36 in Fig. 2 coacting with an armalower ends, as at I3, and extending through the ture 31 which normally closes a circuit through a plate but being insulated therefrom by insulation motor 38. When the armature 31 is drawn tol9 and carrying the nuts 23 which hold the posts wards the magnet 35, the circuit is broken and in place upon the plate. The post I! is shown as the motor stops. This is to be understood as be- 55 ing purely diagrammatic and that I am not in any way limited to the use of any particular form of electrically actuated stop motion or even to an electrically actuated stop motion. The mag net is shown as being connected in circuit with a battery 39 and with the post H and the post 2?. Normally, the knot actuated plate 23 is in lowered position, as shown in Fig. 5, and is, therefore, entirely separated from the arm 32. When, however, a knot in the thread (1 occurs, this knot, not being able to pass through the slot 24, will act to lift the plate 23 and the plate moves upward until the lug 25 strikes the under edge face of the arm 32 of the latch thereby closing the circuit from the post El through the latch to the post 2? and thus by wires and 4f completing the circuit through the magnet and the battery or other source of current, This immediately stops the machine. It will be noted that the plate 23 can turn on its pivots to a position to permit the knot to pass upward through the V-shaped notch to a point above the plate and that, therefore, no strain is placed upon the thread or yarn which would tend to break it. The knot may then be eliminated by hand and then the plate 23 which has been held in its raised position by the latch, as shown in Fig. 6, can be manually lowered to its initial position and the machine started up again.

I have illustrated in Fig. 2 a spring 42 which will act to automatically retract the armature or switch 37 upon the breaking of the circuit through wires 40 and 4 I, this spring causing the armature to immediately close the circuit through the motor 38 to permit the immediate starting up of the machine.

It will be seen that as long as the yarn is uniform, it will pass through the slot 24 without hindrance but that as soon as a knot or any thickness of yarn appears, this thickened portion or knot will pull the plate 23 up, as before described, and stop the machine.

t will be also noted that there are no complicated parts which can get out of order with this mechanism. It is very simple, can be readily applied in a large variety of different situations and has been found thoroughly effective in actual practice. It is to be particularly noted that it places no strain upon the yarn inasmuch as the plate 23 can turn upward until the yarn escapes from the slot but that, however much the plate may lift or turn upward, it cannot turn backward because of the ratchet teeth 35 on the arm 32.

The very acute V-shaped notch 24 is particularly important in connection with the plurality of ratchet teeth on the arm or pawl 32. As the plate moves upward, the thread relatively moves into a wider portion of the V-shaped slot 24, that is, away from the rear end of the slot, and eventually the knot passes through the slot. At this time the ratchet 22 has caught the pawl-like arm 23 and the machine is stopped with no tension applied to the thread. If the knot is small it escapes through the slot quicker than if the knot or slub be large, but at the most, the only extraneous tension applied to the thread is that due to the weight of the very light plate 23, if no spring 34 is used, or the weight of the plate plus the tension of this very light spring 34. Whether the plate is lifted quickly or slowly, that is, whether the thread is running rapidly or slowly and whether the plate is lifted only a short distance or higher, the effect is the same. The plate contacts almost immediately with the arm 32 closing the circuit through the stopping mechanism and then, though the thread may run on through inertia, yet there will be practically no tension on the thread. There is no chance in my construction, of the plate 23 falling back accidently and leaving the knot to escape after once the plate is lifted. This gives a smoother action and closes the circuit in any position of the plate. If a knot is small and the machine is slow on account of a heavy load, it will lift the plate only into the first or second notch of the pawl 32, or if a heavier knot comes in contact with the walls of the slot, the plate will fly up to the last position without vibration and without moving forward or backward. If there was only one tooth to hold this plate, these two extreme cases would cause vibration of the plate either up or down and the plate would touch the thread and cause unnecessary tension on the yarn, the result of which would be a faulty drawn stitch in the cloth.

What is claimed is:

1. Knot detecting and stopping mechanism for textile machines, including a supporting member, insulated posts extending upward therefrom, a plate rotatably mounted in said posts, the plate having an inwardly extending slot through which a yarn is adapted to pass, the slot being of such width as to permit the free passage of the yarn when of a uniform diameter but preventing the passage of the yarn when knotted or thickened, the plate having a projecting lug at one end, a latch pivotally supported upon the said support and having an arm extending down over said lug. the arm being formed with ratchet notches, means for preventing the arm from contacting with the plate when the latter is in a lowered position, the ratchet notches in the arm engaging said lug and holding the plate raised, one of the posts supporting the plate and the latch being electrically connected in circuit with a stop motion actuating device.

2. Knot detecting and stopping mechanism for textile machines, including a support, a pair of posts extending upward from the support and insulated therefrom, a plate having pintles engaging in said posts, the plate being rotatable in a vertical plane and having a forwardly projecting middle portion formed with an inwardly extending slot through which yarn is adapted to pass, the walls of the slot engaging with a knot or thickened portion in the yarn whereby to cause the lifting of the plate when so engaged, the plate having a lug at one end, a third post extending upward from the support and insulated therefrom, a latch pivotally mounted upon said third post and having an arm extending outward and downward in spaced relation to the lug of said plate, the under edge face of the yarn having ratchet notches engageable with the lug when the plate is tilted upward, a spring urging the arm downward, and means connecting one of the first named posts and the third named post in circuit with a source of current and an electrically actuated stop mechanism.

3. Knot detecting and stopping mechanism for textile machines, including a plate mounted for free swinging movement in a vertical plane, the plate extending transversely to the run of the yarn, the plate having an open-ended acutely V-shaped slot extending inward from the free edge face of the plate and through which a yarn is adapted to pass, the slot permitting the passage of yarn when of normal diameter but preventing the passage of a knot or thickened portion pawl engages the latch will hold the plate at any one of a plurality of elevations and from return movement after being lifted by the yarn, the plate and the latch being electrically connected in circuit with a stop motion actuating 5 device. MITCHELL H. ROSENFELD. 

